Id like the graphics to saty the same.

make aerith live, see what people do

Differentiation of the characters in the battle system wouldn't make sense in the world of FFVII.
There is no reason for Barret to not be able to use magic that Yuffie or Cid can.
Making some materia limited to some characters means story changes.
Materia comes from the planet, so there would need to be a reason character x is connected to materia x.

You could make a case for Red and maybe Vincent being able to use specific materia though. And Aeris is the only one that can use Holy.

Besides that, with materia you can make countless 'job classes'.
More than in any other rpg I've played.
In FFVII you create the classes yourself. Hybrid classes, triplebrid classes.
You can even make a Frogger job class. Someone who opens the battle with Toad, counters with Toad, hits with Toad and even uses Toad as a final attack and so.
Its the coolest battle system ever.

And the battle system of the game can get super fast with max materia and speed stat maxing and the battles being set on the active mode of course and battle speed fast. Many people havent seen FFVII on its fastest or even close to its fastest. (So you can image what the speed can be in the pc port on PS4 when set on 3x game speed, it wont be turned based anymore ...)

Spoilers dude, spoilers.

Nah, I would like just a presentation overhaul, enemy difficulty upgrade across the board, a better translation and expanded story. What I listed was more of things I figured would be cut (and had come to term with the idea these things would be cut).

The combat. A relic of the past. Would be nice if there was an option to switch between old and new but the work involved for that to happen.... FF7R would release in 2099.

Chocobo racing. Flesh it out a bit.

It'll probably come with the limited edition.  

Square could look at Chocobo Racing for inspiration. :D

More info on some of the characters.